The grass block, grass, tall grass, fern, and large fern appear gray when being held.
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I have noticed the same with the spawn eggs. Their colors seem to be a bit off.
Thank you for your report!
We're actually already tracking this issue in MC-161841 and MC-161837, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main tickets it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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